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Yes I used to work at the zoo (as a gardener) so I have a huge collection of different feathers and types of bamboo and grasses I love to draw with! Its quite simple to make a bamboo pen you just cut it on an angle just below a node this creates a sharp point to draw with and a reservoir for the ink to fill inside the stem up to the node.
I also like to frey the other end so it becomes a stiff brush, this works better with elephant grass rather than bamboo though, as it is softer and bamboo is quite hard and can be quite sharp if you tried to frey one end of it you might cut yourself.
Perhaps soon I will do a post about different organic pens.